Many games from AppStore are hacked
Apple's Fairplay DRM, which protects all the applications you download from iTunes, has been hacked. The method for hacking this has actually been around for a while, but has been recently applied to Super Monkey Ball and distributed into the wild. To do this, you'll need a jailbroken iPhone and SSH installed (to transfer the game and to fiddle with permissions). The theory is a bit techy and complex, but the execution isn't too insane. iPhone developers are disappointed about this